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In ext4fs_read_file in ext4fs.c, a memset can overwrite the bounds of
the destination memory region. This patch adds a check to disallow
this.
Signed-off-by: Paul Emge <[email protected]>
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This patch checks for 0 in several ext4 headers and gracefully
fails instead of raising a divide-by-0 exception.
Signed-off-by: Paul Emge <[email protected]>
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in ext4fs_read_file, it is possible for a broken/malicious file
system to cause a memcpy of a negative number of bytes, which
overflows all memory. This patch fixes the issue by checking for
a negative length.
Signed-off-by: Paul Emge <[email protected]>
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ext_cache_read doesn't null cache->buf, after freeing, which results
in a later function double-freeing it. This patch fixes
ext_cache_read to call ext_cache_fini instead of free.
Signed-off-by: Paul Emge <[email protected]>
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JOURNAL is optional for EXT4 (and EXT3) filesystems, so add support for
skipping it. This fixes corrupting EXT4 volumes without JOURNAL after
using uboot's 'ext4write' command.
Signed-off-by: Marek Szyprowski <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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The block count entry in the EXT4 filesystem disk structures uses
standard 512-bytes units for most of the typical files. The only
exception are HUGE files, which use the filesystem block size, but those
are not supported by uboot's EXT4 implementation anyway. This patch fixes
the EXT4 code to use proper unit count for inode block count. This fixes
errors reported by fsck.ext4 on disks with non-standard (i.e. 4KiB, in
case of new flash drives) PHYSICAL block size after using 'ext4write'
uboot's command.
Signed-off-by: Marek Szyprowski <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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Ext4 allows for arbitrarily sized block group descriptors when 64-bit
addressing is enabled, which was previously not properly supported. This
patch dynamically allocates a chunk of memory of the correct size.
Signed-off-by: Benjamin Lim <[email protected]>
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Hi,
when I try to load a sparse file via ext4load, I am getting the error message
'invalid extent'
After a deeper look in the code, it seems to be an issue in the function ext4fs_get_extent_block in fs/ext4/ext4_common.c:
The file starts with 1k of zeros. The blocksize is 1024. So the first extend block contains the following information:
eh_entries: 1
eh_depth: 1
ei_block 1
When the upper layer (ext4fs_read_file) asks for fileblock 0, we are running in the 'invalid extent' error message.
For me it seems, that the code is not prepared for handling a sparse block at the beginning of the file. The following change, solved my problem:
I am really not an expert in ext4 filesystems. Can somebody please have a look at this issue and give me a feedback, if I am totally wrong or not?
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Re-use the functions used to write/create a file, to support creation of a
symbolic link.
The difference with a regular file are small:
- The inode mode is flagged with S_IFLNK instead of S_IFREG
- The ext2_dirent's filetype is FILETYPE_SYMLINK instead of FILETYPE_REG
- Instead of storing the content of a file in allocated blocks, the path
to the target is stored. And if the target's path is short enough, no block
is allocated and the target's path is stored in ext2_inode.b.symlink
As with regulars files, if a file/symlink with the same name exits, it is
unlinked first and then re-created.
Signed-off-by: Jean-Jacques Hiblot <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
[trini: Fix ext4 env code]
Signed-off-by: Tom Rini <[email protected]>
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There is no need to modify the buffer passed to ext4fs_write_file().
The memset() call is not required here and was likely copied from the
equivalent part of the ext4fs_read_file() function where we do need it.
Signed-off-by: Jean-Jacques Hiblot <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
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When a file contains extents, U-Boot currently reads extent-related data
for each block in the file, even if that data is located in the same
block each time. This significantly slows down loading of files that use
extents. Implement a very dumb cache to prevent repeatedly reading the
same block. Files with extents now load as fast as files without.
Note: There are many cases where read_allocated_block() is called. This
patch only addresses one of those places; all others still read redundant
data in any case they did before. This is a minimal patch to fix the
load command; other cases aren't fixed.
Signed-off-by: Stephen Warren <[email protected]>
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U-Boot doesn't support metadata_csum feature. Writing to filesystem with
metadata_csum feature makes the filesystem corrupted and unbootable by
Linux:
[ 2.527495] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 0 failed (52188!=0)
[ 2.537421] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 1 failed (5262!=0)
...
[ 2.653308] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 14 failed (42611!=0)
[ 2.662179] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 15 failed (21527!=0)
[ 2.687920] JBD2: journal checksum error
[ 2.691982] EXT4-fs (mmcblk0p2): error loading journal
[ 2.698292] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -74
Don't write to filesystem with meatadata_csum feature to not corrupt the
filesystem.
Signed-off-by: Sébastien Szymanski <[email protected]>
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In int-ll64.h, we always use the following typedefs:
typedef unsigned int u32;
typedef unsigned long uintptr_t;
typedef unsigned long long u64;
This does not need to match to the compiler's <inttypes.h>.
Do not include it.
The use of PRI* makes the code super-ugly. You can simply use
"l" for printing uintptr_t, "ll" for u64, and no modifier for u32.
Signed-off-by: Masahiro Yamada <[email protected]>
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Found a crash while issuing ext4ls with a non-existent directory.
Crash test:
=> ext4ls mmc 0 1
** Can not find directory. **
data abort
pc : [<3fd7c2ec>] lr : [<3fd93ed8>]
reloc pc : [<26f142ec>] lr : [<26f2bed8>]
sp : 3f963338 ip : 3fdc3dc4 fp : 3fd6b370
r10: 00000004 r9 : 3f967ec0 r8 : 3f96db68
r7 : 3fdc99b4 r6 : 00000000 r5 : 3f96dc88 r4 : 3fdcbc8c
r3 : fffffffa r2 : 00000000 r1 : 3f96e0bc r0 : 00000002
Flags: nZCv IRQs off FIQs off Mode SVC_32
Resetting CPU ...
resetting ...
Tested on SAMA5D2_Xplained board (sama5d2_xplained_mmc_defconfig)
Looks like crash is introduced by commit:
"fa9ca8a" fs/ext4/ext4fs.c: Free dirnode in error path of ext4fs_ls
Issue is that dirnode is not initialized, and then freed if the call
to ext4_ls fails. ext4_ls will not change the value of dirnode in this case
thus we have a crash with data abort.
I added initialization and a check for dirname being NULL.
Fixes: "fa9ca8a" fs/ext4/ext4fs.c: Free dirnode in error path of ext4fs_ls
Cc: Stefan Brüns <[email protected]>
Cc: Tom Rini <[email protected]>
Signed-off-by: Eugen Hristev <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
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When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <[email protected]>
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Other filesystem drivers don't do this.
Signed-off-by: Marek Behun <[email protected]>
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Migrate the following symbols to Kconfig:
CONFIG_FS_EXT4
CONFIG_EXT4_WRITE
The definitions in config_fallbacks.h can now be expressed in Kconfig.
Signed-off-by: Tuomas Tynkkynen <[email protected]>
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Some fixes when reading EXT files and directory entries were identified
after using e2fuzz to corrupt an EXT3 filesystem:
- Stop reading directory entries if the offset becomes badly aligned.
- Avoid overwriting memory by clamping the length used to zero the buffer
in ext4fs_read_file. Also sanity check blocksize.
Signed-off-by: Ian Ray <[email protected]>
Signed-off-by: Martyn Welch <[email protected]>
Reviewed-by: Stefano Babic <[email protected]>
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As reported by Coverity, we did not free dirnode in the case of failure.
Do so now.
Reported-by: Coverity (CID: 131221)
Cc: Stefan Brüns <[email protected]>
Signed-off-by: Tom Rini <[email protected]>
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The current code doesn't compute the group descriptor checksum correctly
for the filesystems that e2fsprogs 1.43.4 creates (they have
'Group descriptor size: 64' as reported by tune2fs). Extend the checksum
calculation to be done as ext4_group_desc_csum() does in Linux.
This fixes these errors in dmesg from running fs-test.sh and makes it
succeed again:
[1671902.620699] EXT4-fs (loop1): ext4_check_descriptors: Checksum for group 0 failed (35782!=10965)
[1671902.620706] EXT4-fs (loop1): group descriptors corrupted!
Signed-off-by: Tuomas Tynkkynen <[email protected]>
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The ext4, reiserfs and zfs filesystems all have their own implementation
of the same function, *_devread. Generalize this function into fs_devread
and put the code into fs/fs_internal.c.
Signed-off-by: Marek Behun <[email protected]>
[trini: Move fs/fs_internal.o hunk to the end of fs/Makefile as all
cases need it]
Signed-off-by: Tom Rini <[email protected]>
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While &p_jdb[fs->blksz] is a valid expression (it points *one* char
sized element past the end of the array, e.g. &p_jdb[fs->blksz + 1] is
invalid (according to the C standard (C99/C11)).
Changing this to tag = (struct ext3_journal_block_tag *)(p_jdb + ofs);
Cc: Stefan Brüns <[email protected]>
Suggested-by: Stefan Brüns <[email protected]>
Reported-by: Coverity (CID: 165117, 165110)
Signed-off-by: Tom Rini <[email protected]>
Reviewed-by: Stefan Brüns <[email protected]>
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In file ext4fs.c funtion ext4fs_read_file() compares an
unsigned expression with < 0 like below
lbaint_t blknr;
blknr = read_allocated_block(&(node->inode), i);
if (blknr < 0)
return -1;
blknr is of type ulong/uint64_t. read_allocated_block() returns
long int. So comparing blknr with < 0 will always be false. Instead
declare blknr as long int.
Similarly ext4/dev.c does a similar comparison. Drop the redundant
comparison.
Signed-off-by: Lokesh Vutla <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
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genext2fs creates revision level 0 filesystems, which are not readable
by u-boot due to the initialized group descriptor size field.
f798b1dda1c5de818b806189e523d1b75db7e72d
Reported-by: Kever Yang <[email protected]>
Reported-by: [email protected]
Signed-off-by: Stefan Brüns <[email protected]>
Tested-by: Kever Yang <[email protected]>
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Support was already implemented, but not hooked up. This fixes several
fails in the test cases.
Signed-off-by: Stefan Brüns <[email protected]>
Acked-by: Stephen Warren <[email protected]>
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A sparse file may have regions not mapped by any extents, at the start
or at the end of the file, or anywhere between, thus not finding a
matching extent region is never an error.
Found by python filesystem tests.
Signed-off-by: Stefan Brüns <[email protected]>
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Instead of creating a journal entry for each directory block, even
if the block is unmodified, only log the modified block.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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The direntlen checks were quite bogus, i.e. the loop termination used
"len + offset == blocksize" (exact match only), and checked for a
direntlen less than 0. The latter can never happen as the len is
unsigned, this has been reported by Coverity, CID 153384.
Use the same code as in search_dir for directory traversal. This code
has the correct checks for direntlen >= sizeof(struct dirent), and
offset < blocksize.
Signed-off-by: Stefan Brüns <[email protected]>
Reported-by: Coverity (CID: 153383, 153384)
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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Use the same variable names as in search_dir, to make purpose of variables
more obvious.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
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Now, arch/${ARCH}/include/asm/errno.h and include/linux/errno.h have
the same content. (both just wrap <asm-generic/errno.h>)
Replace all include directives for <asm/errno.h> with <linux/errno.h>.
Signed-off-by: Masahiro Yamada <[email protected]>
[trini: Fixup include/clk.]
Signed-off-by: Tom Rini <[email protected]>
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Enable mounting of ext4 fs with 64bit feature, as it is supported now.
These had been disabled in 6f94ab6656ceffb3f2a972c8de4c554502b6f2b7.
Signed-off-by: Stefan Brüns <[email protected]>
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Also adjust high 16/32 bits when free inode/block counts are modified.
Signed-off-by: Stefan Brüns <[email protected]>
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The descriptor size is variable, thus array indices are not generically
applicable. The larger group descriptors also contain e.g. high parts
of block numbers, which have to be read and written.
Signed-off-by: Stefan Brüns <[email protected]>
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The correct descriptor size must be used when calculating offsets, and
also to read the correct amount of data.
Signed-off-by: Stefan Brüns <[email protected]>
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The helper functions encapsulate access of the block group descriptors,
independent of group descriptor size. The helpers also deal with the
endianess of the fields, and with split fields like free_blocks/
free_blocks_high.
Signed-off-by: Stefan Brüns <[email protected]>
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If EXT4_FEATURE_INCOMPAT_64BIT is set, the descriptor can be read from
the superblocks, otherwise it defaults to 32.
Signed-off-by: Stefan Brüns <[email protected]>
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If the same block is updated multiple times in a row during a single
file system operation, gd_index is decremented to use the same journal
entry again. Avoid loosing the already allocated buffer.
Signed-off-by: Stefan Brüns <[email protected]>
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read_allocated block may return block number 0, which is just an indicator
a chunk of the file is not backed by a block, i.e. it is sparse.
During file deletions, just continue with the next logical block, for other
operations treat blocknumber <= 0 as an error.
For writes, blocknumber 0 should never happen, as U-Boot always allocates
blocks for the whole file. Reading already handles this correctly, i.e. the
read buffer is 0-fillled.
Not treating block 0 as sparse block leads to FS corruption, e.g.
./sandbox/u-boot -c 'host bind 0 ./sandbox/test/fs/3GB.ext4.img ;
ext4write host 0 0 /2.5GB.file 1 '
The 2.5GB.file from the fs test is actually a sparse file.
Signed-off-by: Stefan Brüns <[email protected]>
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The data blocks are identical for files using traditional direct/indirect
block allocation scheme and extent trees, thus this code part can be
common. Only the code to deallocate the indirect blocks to record the
used blocks has to be seperate, respectively the code to release extent
tree index blocks.
Actually the code to release the extent tree index blocks is still missing,
but at least add a FIXME at the appropriate place.
Signed-off-by: Stefan Brüns <[email protected]>
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Make sure the the extra_isize field (offset 128) is initialized to 0, to
mark any extra data as invalid.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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fs->inodesz is already correctly (i.e. dependent on fs revision)
initialized in ext4fs_mount.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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temp_ptr should always be freed, even if the function is left via
goto fail.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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If the blocksize is 1024, count is initialized with 1. Incrementing count
by 8 will never match (count == fs->blksz * 8), and ptr may be
incremented beyond the buffer end if the bitmap is filled. Add the
startblock offset after the loop.
Remove the second loop, as only the first iteration will be done.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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The last free block of a block group may be in its middle. After it has
been allocated, the next block group should be scanned from its beginning.
The following command triggers the bad behaviour (on a blocksize 1024 fs):
./sandbox/u-boot -c 'i=0; host bind 0 ./disk.raw ;
while test $i -lt 260 ; do echo $i; setexpr i $i + 1;
ext4write host 0:2 0 /X${i} 0x1450; done ;
ext4write host 0:2 0 /X240 0x2000 ; '
When 'X240' is extended from 5200 byte to 8192 byte, the new blocks should
start from the first free block (8811), but it uses the blocks 8098-8103
and 16296-16297 -- 8103 + 1 + 8192 = 16296. This can be shown with
debugfs, commands 'ffb' and 'stat X240'.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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zero_buffer is never written, thus clearing it is pointless.
journal_buffer is completely initialized by ext4fs_devread (or in case
of failure, not used).
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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e2fsck warns about "Group descriptor 0 marked uninitialized without
feature set."
The bg_itable_unused field is only defined if FEATURE_RO_COMPAT_GDT_CSUM
is set, and should be set (kept) zero otherwise.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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Scanning only the direct blocks of the directory file may falsely report
an existing file as nonexisting, and worse can also lead to creation
of a duplicate entry on file creation.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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While directories can be read using the old linear scan method, adding a
new file would require updating the index tree (alternatively, the whole
tree could be removed).
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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Previously, only the last directory block was scanned for available space.
Instead, scan all blocks back to front, and if no sufficient space is
found, eventually append a new block.
Blocks are only appended if the directory does not use extents or the new
block would require insertion of indirect blocks, as the old code does.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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The following command crashes u-boot:
./sandbox/u-boot -c 'i=0; host bind 0 ./sandbox/test/fs/3GB.ext4.img ;
while test $i -lt 200 ; do echo $i; setexpr i $i + 1;
ext4write host 0 0 /foobar${i} 0; done'
Previously, the code updated the direct_block even for extents, and
fortunately crashed before pushing garbage to the disk.
Signed-off-by: Stefan Brüns <[email protected]>
Reviewed-by: Lukasz Majewski <[email protected]>
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